Furnace.



PATENTED AUG. 2

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lase T (7 J. T. GREENE, DECD. F.1d. GREENE. ADMINISTRATOR.

FURNACE.

APPLIGATION FILED MAB. ao. 1904.

No MODEL.

PATENTED AUG. 2, 1904.

J. T. GREENE, DBCD. P. M. GREENE, ADMINISTRATOR.

FURNACE.

VAPPLICATION FILED MAB. ao. 1904.

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HO MODEL.

Ilillllllllllll No. 766,440. I PATENTED AUG. 2, 1904.

J. T. GREENE, DECD.

r. M. GREENE, ADMINIsTnAToB. PURNACB.

APPLIOATION FILED mn. ao. 1904.

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No. l'?'66,440.

UNITED STATES Patented August 2, 1904.

PATENT OFFICE- FRANK. M. GREENE, OF MINNEAPOLIS, MINNESOTA, ADB/[INISTRAIOR OF Y JESSE T. GREENE, DECEASED, ASSIGNOR OF ONF'l`E\Vl`H TO AGUSTUS RUEFNER, OE CHICAGO, ILLINOIS.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 766,440, dated August 2, 1904.

Application filed March 30, 1904.

To rf/Z mlm/rt 'it min/ U con/cern:

Be it known that JEssE T. GREENE, deceased, late a citizen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, did invent new and useful Improvements in Furnaces, of which the following' .is a specification.

This invention relates to an improvement in boiler-furnaces of the class set forth in Letters Patent No. 581,347, dated April 2T, 1897, and has for its object to provide an attachment to be more especially used in connection with the style of furnace shown in the above-noted patent for the purpose of increasing' the heating and steam-generating surfaces, and thereby utilizing a greater percentage of the fuel than is possible under ordinary conditions.

In the drawings, Figure l is a part elevation and longitudinal section on line 1,.Fig. 3, looking' in the direction indicated by the arrow. Fig. 2 isalongitudinal section on line 2, Fig. 3, the boiler being' shown in elevation; and Fig. 3 is a transverse section on line 3, Fig. l.

VIt is not the purpose of this invention to materially change the form of the furnace set forth in the patent referred to. The description will therefore be principally confined to the new features, making' such references to the old parts as may be necessary in properly presenting the matter.

A represents the inclosing wall of masonry; A', theboiler; B, ahot-air chamber; C, ahollow heat-collecting cylinder, and D the combustion-chamber. The heat-collecting cylinder is located in the hot-air chamber under the boiler and extends longitudinally therewith, the respective ends being supported in the front and bridge walls, as shown in Fig. 2. 40 This heat-concentrating cylinder is closed at the front end, open at the rear discharge end, and is provided in the opposite sides with a number of slot-openings 4, following' the curvature of the cylinder, and in the under side with a longitudinal opening' 5, extending' from end to end. The heated air enters the cylinder C through the different openings therein and is discharged from the rear end and Serial No. 200,846. (No model brought in contact with the boiler-surface to be heated.

A series of inclined grate-bars 6 are located at each side of the furnace and extend along the length thereof. The upper ends of these bars are supported on a plate 7, embedded, Fig. 3, in the inclosing walls, and the lower ends by means of a number of brackets 8. The space between thel lower ends of the inclined bars is filled with the horizontal rocking' grate-bars 9, which may be actuated by any suitable means in dischargingthe waste products of combustion into the ash-pit.

A water heating and circulating cylinder or drum lO is located under the heat-collecting cylinder C and is set so that about onehalf of its diameter is in the hot-air chamber B and the lower half in the combustion-chamber D. A water-cylinder l2 is located at one side of the boiler and is provided at each end with pipe connections 18, which open into the boiler below the water-line. A companion cylinder 14 is located on the opposite side of the boiler and is connected therewith in the same manner as cylinder 12. The companion cylinders l2 and I4 are set close up to the boiler and have a part of their surface exposed to the direct action of the heat in the hot-air chamber and also have approximately onehalf of their diameter extending into the fuelpassage l5 above the combustion-chamber, so as to receive the heat from all sides.

The lower larger water-cylinder is connected on one side with the circulating-cylinder 12 by a number of drop tubes or pipes 16 and on the opposite is connected with cylinder 14 by a number of corresponding 85 tubes 17, as best shown in Fig. 3. The circulating' drop-tubes are positioned alternately or staggered and provide spaces 18 therebetween for the passage of heated air from the combustion-chamberinto the hot-air chamber surrounding the concentrating-cylinder C. The drop-tubes are inclined somewhat from the upper ends downward and curved as the lower ends are approached in conforming to the contour of the inclined grate-bars and gradually contracting the fuel-passage l5 until it opens into the combustion-chamber B. The drop-tubes divide the combustion-chamber and fuel-passage from the hot-air chamber and prevents entrance thereinto of particles of fuel and at the same time allows for a free circulation and proper distribution of the heated air.

The fuel will be automatically supplied from a reservoir (not shown) and the inclined fuel-passage kept iilled as it gravitates into the combustion-chamber. The coal will be coked and made incandescent for some way up on each side, so that by the time it reaches the combustion-chamber proper it is in a highlyinflammable condition and aifords the best possible results in maintaining a continuous high temperature.

The water-heating cylinders and connections maintain a continuous circulation from and back into the boiler, presenting so much additional heating and steam-generating surface within a contracted space and economically utilizing a large percentage of the fuel and heat thatis ordinarily lost.

This invention is not limited to the precise construction and relative position of the different parts shown; but such changes may be made as necessary in practical working without departing from the scope of the invention.

Having thus described the invention, what is claimed isF l. A furnace, combining a hot-air chamber, a combustion-chamber, a plurality of waterheating cylinders spaced apart, a series of drop-tubes connecting and maintaining a circulation between said cylinders, the inclined grate-bars, and a fuel-passage extending down between the drop-tubes and inclined gratebars.

2. A furnace, combining a boiler, a hot-air chamber, a combustion-chamber, a number of water-heating cylinders a series of drop-tubes connecting said cylinders and maintaining a continuous circulation therethrough with the boiler, the inclined grate-bars, and a fuel-passage forming a division between the droptubes and inclined grate-bars.

3. Afurnace, combining a boiler, a hot-air chamber, a heat-collecting cylinder located therein, a combustion-chamber, a number of water-heating cylinders spaced apart, a series of drop-tubes connecting the water-cylinders in maintaining a continuous circulation with the boiler, the inclined grate-bars, and a fuelsupply passage located between the drop-tubes and inclined grate-bars and opening into the combustion-chamber.

4f. In a furnace, the combination with a boiler, of companion water-heating cylinders located on opposite sides of said boiler and having tubular connections therewith, a third water-heating' cylinder located belowthe companion cylinders and on aline extending vertically therebetween,and the drop-tubes forming a circulating connection between the respective cylinders.

5. In a furnace, the combination with a boiler, of companion water-heating cylinders located on opposite sides thereof and having tubular connections therewith below the water-line, athird water-heating cylinder located below the upper cylinders, the inclined droptubes connecting the respective cylinders in a circulating series the inclined grate-bars, and the fuel-passage extending down between the drop-tubes and grate-bars and vanishing in the combustion-chamber.

6. In a furnace, the combination with a` boiler, of a hot-air chamber located thereunder, a combustion-chamber, below the air-chamber, the companion hot-water cylinders located on each side of said boiler and having tubular connection therewith, a third hot-water cylinder located in a lower plane than the companion cylinders and spaced between the hot-air chamber and combustion-chamber and the series of drop-tubes connecting the respective cylinders in maintaining a continuous circulation.

7. In a furnace, a boiler, a heat-collecting cylinder located therein, a combustion-chamber, a number of hot-water cylinders having a circulating connection with said boiler, the drop-tubes having air-spaces between and connecting the hot-water'cylinders in a circulating series, the inclined grate-bars extending down parallel with the drop-tubes at each side, the fuel-passage between the drop-tubes and inclined bars, and the horizontal rocking gratebars filling in the space between the lower ends of the inclined bars.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses'.

FRANK. M. GREENE, Aclmfim'stmorof he estate of Jesse T. Greene,

deceased.

Witnesses:

FRANK S. DANFORTH, ALBERT D. READE.

IOO 

